Purification device with regeneration pressure monitoring function

Abstract

The utility model relates to the technical field of purification, and provides a purification device with a regeneration pressure monitoring function, which comprises a filter tank and a purification tank, the filter tank is provided with an air inlet, a breather pipe is connected between the filter tank and the purification tank, the purification tank is provided with an air outlet, a filter medium is filled in the filter tank, and an adsorbent is filled in the purification tank. Pressure sensors are fixed to the top and the bottom of the purification tank, the purification tank is connected with an extraction structure used for extracting gas attached in the adsorbent, a supporting structure used for preventing the adsorbent structure from being impacted is arranged in the purification tank, the purification tank is provided with a controller used for controlling a regeneration structure, and a first electronic valve is arranged between the extraction structure and the purification tank; the breather pipe and the air outlet are each provided with a second electronic valve. According to the technical scheme, the problems that in the prior art, a purification device needs to be shut down for a long time and the purification efficiency is affected due to the fact that a large amount of time needs to be consumed when an internal adsorbent is regenerated are solved.

Description

Technical Field

[0001] This utility model relates to the field of purification technology, specifically to a purification device with regeneration pressure monitoring function. Background Technology

[0002] Gas purification is a crucial operation in industrial production, scientific research, and many other fields. Existing gas purification devices primarily use adsorbents to remove impurities from gases, thereby purifying them. These adsorbents are typically packed in specific tanks or towers. When gas containing impurities passes through the adsorbent bed, the impurity molecules are adsorbed onto the surface or within the pores of the adsorbent, thus purifying the outflowing gas.

[0003] Currently, there are various methods for regenerating adsorbents, including heating regeneration, displacement regeneration, and vacuum regeneration. Heating regeneration involves raising the temperature of the adsorbent so that the adsorbed impurities gain sufficient energy to desorb from the adsorbent surface. Displacement regeneration uses a substance with a stronger adsorption capacity to replace the impurities. Vacuum regeneration involves changing the chemical potential of the adsorbate on the adsorbent surface under reduced pressure, causing the adsorbate to desorb from the adsorbent.

[0004] Traditional gas purification devices have significant shortcomings in regenerating internal adsorbents using depressurization regeneration methods. During regeneration, the system pressure needs to be reduced slowly to prevent damage to the adsorbent from rapid gas expansion, making the entire process time-consuming. This slow process necessitates prolonged shutdowns of the purification unit, preventing continuous gas purification. This not only severely impacts purification efficiency but also poses a significant risk to industrial processes with high requirements for continuous gas supply, such as semiconductor manufacturing and continuous chemical production. Interruptions or impurities in the gas supply can lead to production stoppages, decreased product quality, and other problems. Furthermore, prolonged downtime for regeneration increases operating costs and reduces equipment utilization and economic benefits. Utility Model Content

[0005] This invention proposes a purification device that can effectively monitor regeneration pressure and improve regeneration efficiency, thereby increasing adsorbent regeneration efficiency and shortening purification device downtime.

[0006] The technical solution of this utility model is as follows:

[0007] A purification device with regeneration pressure monitoring function includes a filter tank and a purification tank. The filter tank is provided with an air inlet. A vent pipe connects the filter tank and the purification tank. The purification tank is provided with an air outlet. The filter tank is filled with a filter medium. The purification tank is filled with an adsorbent. Pressure sensors are fixed at the top and bottom of the purification tank. The purification tank is connected to an extraction structure for extracting gas adhering to the adsorbent. The purification tank is provided with a support structure to prevent the adsorbent structure from being impacted. The purification tank is provided with a controller for controlling the regeneration structure. A first electronic valve is provided between the extraction structure and the purification tank. A second electronic valve is provided at both the vent pipe and the air outlet.

[0008] Furthermore, the extraction structure includes a rotary vane vacuum pump and a molecular pump, both of which are connected to the purification tank. The controller is electrically connected to both the rotary vane vacuum pump and the molecular pump and is used to control the start-up time and power of the rotary vane vacuum pump and the molecular pump. A first electronic valve is provided between the rotary vane vacuum pump and the purification tank and between the molecular pump and the purification tank.

[0009] Furthermore, flow meters are installed between the rotary vane vacuum pump and the purification tank, and between the molecular pump and the purification tank.

[0010] Furthermore, the support structure includes several layers of metal wire mesh, which are arranged longitudinally inside the purification tank, and the adsorbent is uniformly filled between adjacent metal wire meshes.

[0011] Furthermore, the plurality of said metal wire meshes include end metal wire meshes closest to the top or bottom of the purification tank and middle metal wire meshes located in the middle of the purification tank. The meshes of the end metal wire meshes are honeycomb-shaped, and the meshes of the middle metal wire meshes are rhomboid-shaped.

[0012] Furthermore, the purification tank is fitted with an electric heating jacket, and the controller is electrically connected to the electric heating jacket to control the heating time and heating temperature of the electric heating jacket.

[0013] The working principle and beneficial effects of this utility model are as follows:

[0014] 1. This invention, by installing a pressure sensor on the purification tank, enables real-time monitoring of pressure changes during the regeneration process. Combined with a controller, it allows for more precise control of the extraction structure, enabling optimized depressurization regeneration strategies (such as gradient depressurization). This avoids the time wasted due to overly conservative depressurization methods in traditional depressurization regeneration, effectively shortening regeneration time and reducing downtime of the purification unit. The regeneration process of this invention can be shortened to 1-2 hours, compared to 2-5 hours for traditional depressurization regeneration, reducing regeneration time by 1-3 hours or even more.

[0015] 2. This invention provides support for the adsorbent during the reduced-pressure regeneration process through a support structure within the purification tank, preventing rapid gas expansion from damaging the adsorbent structure. This allows for a faster depressurization rate during regeneration without concern for adsorbent damage, further shortening the regeneration time. Simultaneously, it ensures the long-term stable use of the adsorbent, reducing frequent replacements and equipment downtime due to adsorbent damage.

[0016] 3. The controller of this invention coordinates the operation of various components (such as valves and extraction structures) and automatically adjusts the regeneration process based on data feedback from pressure sensors. This automated control method is more precise and efficient than traditional manual or simple control methods, optimizes the entire regeneration process, improves regeneration efficiency, and reduces the impact of downtime on purification efficiency. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a front view of the present invention;

[0020] Figure 3 This is a rear view of the present invention;

[0021] Figure 4 for Figure 2 Sectional view at point AA.

[0022] In the diagram: 1. Purification tank; 2. Filter tank; 3. Rotary vane vacuum pump; 4. Molecular pump; 5. Controller; 7. Electric heating mantle; 11. Gas outlet; 12. Vent pipe; 13. Pressure sensor; 21. Second electronic valve; 34. First electronic valve; 43. Flow meter; 61. End wire mesh; 62. Middle wire mesh. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] like Figures 1-4As shown in the figure, this embodiment proposes a purification device with regeneration pressure monitoring function, including a filter tank 2 and a purification tank 1. The filter tank 2 is provided with an air inlet. A vent pipe 12 is connected between the filter tank 2 and the purification tank 1. The purification tank 1 is provided with an air outlet 11. The filter tank 2 is filled with a filter medium. The purification tank 1 is filled with an adsorbent. Pressure sensors 13 are fixed at the top and bottom of the purification tank 1. The purification tank 1 is connected to an extraction structure for extracting the gas attached to the adsorbent. A support structure is provided inside the purification tank 1 to prevent the adsorbent structure from being impacted. The purification tank 1 is provided with a controller 5 for controlling the regeneration structure. A first electronic valve 34 is provided between the extraction structure and the purification tank 1. A second electronic valve 21 is provided at both the vent pipe 12 and the air outlet 11.

[0025] The inlet is used to introduce gas containing impurities. The filter medium in filter tank 2 performs preliminary filtration of the gas, removing solid particulate impurities, droplets, and some gaseous impurities. Filter tank 2 protects the subsequent purification tank 1 and the adsorbent, preventing large particulate impurities from clogging the adsorbent pores or damaging the adsorbent, preventing contamination of the adsorbent by impurities, extending the adsorbent's lifespan, and improving the overall purification effect. The filter medium in filter tank 2 can be made of materials such as glass fiber filter paper, metal filter mesh, coalescing filter element, or activated carbon fiber felt. Specifically, the appropriate filter material should be selected based on the type and content of impurities in the actual gas. Vent pipe 12 connects filter tank 2 and purification tank 1, allowing the filtered gas to enter purification tank 1. The second electronic valve 21 controls the flow of gas in vent pipe 12. The second electronic valve 21 allows for easy shut-off of gas flow when needed, such as during the regeneration stage of purification tank 1, preventing new impurities from entering the regenerating purification tank 1 and ensuring that the regeneration process is not disturbed. Purification tank 1 is the core component of gas purification. The adsorbent filled inside removes impurities from the gas. Adsorbents can be made of materials such as activated carbon, molecular sieves, silica gel, and activated alumina; the specific material should be selected based on the types of gases present in the actual gas. The outlet 11 outputs the purified gas, and its second electronic valve 21 controls the gas flow. The second electronic valve 21, located at the outlet 11, prevents backflow of external gases such as air into purification tank 1 during the regeneration phase, ensuring the stability of the adsorbent regeneration environment. The pressure sensor 13 monitors the pressure inside purification tank 1 in real time, providing crucial pressure data for the regeneration process, facilitating accurate understanding of the pressure during adsorbent regeneration and enabling precise control. The extraction structure extracts the gas adhering to the adsorbent, achieving adsorbent regeneration; the first electronic valve 34 controls the gas passage between the extraction structure and purification tank 1. During the regeneration phase, opening the first electronic valve 34 and activating the extraction structure effectively removes impurities adsorbed on the adsorbent, restoring its adsorption capacity; during normal purification, the valve is closed to prevent gas leakage. The support structure is used during adsorbent regeneration to prevent the rapid expansion of gas inside the adsorbent due to depressurization from impacting the adsorbent structure, thereby protecting the integrity of the adsorbent structure and ensuring that the adsorbent maintains good adsorption performance during multiple regeneration processes, reducing adsorbent loss and replacement frequency. Controller 5 controls the regeneration structure, including coordinating the opening and closing of various valves, the operation of the extraction structure, and adjusting the regeneration process based on data from pressure sensor 13, achieving automated control of the entire regeneration process, improving regeneration efficiency and accuracy, and reducing errors that may be caused by manual operation. In this embodiment, controller 5 uses an Omron CP1H PLC. The Omron CP1H PLC has a rich instruction set and function modules, such as timers, counters, and data processing, which can easily implement various complex control logics.In the regeneration pressure monitoring and control of gas purification devices, corresponding control programs can be written according to different pressure ranges and time requirements to ensure the smooth regeneration process of the adsorbent.

[0026] In this embodiment, the extraction structure includes a rotary vane vacuum pump 3 and a molecular pump 4. Both the rotary vane vacuum pump 3 and the molecular pump 4 are connected to the purification tank 1. The controller 5 is electrically connected to both the rotary vane vacuum pump 3 and the molecular pump 4 and is used to control the start-up time and power of the rotary vane vacuum pump 3 and the molecular pump 4. A first electronic valve 34 is provided between the rotary vane vacuum pump 3 and the purification tank 1 and between the molecular pump 4 and the purification tank 1.

[0027] The rotary vane vacuum pump 3 and the molecular pump 4 form the core of the extraction structure, used to reduce the pressure inside the purification tank 1, allowing impurities adsorbed on the adsorbent to desorb under reduced pressure, thus regenerating the adsorbent. The rotary vane vacuum pump 3 is suitable for the initial stage of pressure reduction from atmospheric pressure and can handle large gas flow rates; the molecular pump 4 has high pumping efficiency under low pressure, reducing the pressure inside the purification tank 1 to even lower levels. Working together, they can meet the pumping needs of different pressure ranges. This combination can cover a wide pressure range, improving the efficiency and effect of reduced pressure regeneration. Compared to a single vacuum pump, it can more effectively remove impurities from the adsorbent, restore the adsorption capacity of the adsorbent, and ensure the long-term stable operation of the purification device. The first electronic valve 34 is used to control the gas passage between the rotary vane vacuum pump 3 and the molecular pump 4 and the purification tank 1. During different regeneration stages, the opening and closing of the valve can be precisely controlled by the controller 5 to achieve fine adjustment of the pumping process. The first electronic valve 34 prevents gas leakage when pumping is not needed, ensuring the system's sealing and stability. Simultaneously, during the evacuation process, the controller 5 can coordinate with the vacuum pump to adjust the gas flow rate according to the pressure requirements at different stages, facilitating more precise pressure control and gradient pressure reduction strategies. The controller 5 precisely controls the start-up time and power of the rotary vane vacuum pump 3 and the molecular pump 4 via electrical connections. Based on data feedback from the pressure sensor 13 inside the purification tank 1, the controller 5 can adjust the working state of the vacuum pump according to a preset program. This achieves automated evacuation control, making the decompression and regeneration process more precise and efficient.

[0028] In this embodiment, flow meters 43 are installed between the rotary vane vacuum pump 3 and the purification tank 1, and between the molecular pump 4 and the purification tank 1. The flow meters 43 are used to monitor the flow rate of gas extracted from the purification tank 1 in real time. During the adsorbent regeneration process, especially when using a reduced pressure regeneration method, the amount of gas extracted by the vacuum pump at each stage can be accurately measured.

[0029] In this embodiment, the support structure includes several layers of metal wire mesh, which are arranged longitudinally inside the purification tank 1. The adsorbent is uniformly filled between adjacent metal wire meshes. The metal wire meshes include end metal wire mesh 61 closest to the top or bottom of the purification tank 1 and middle metal wire mesh 62 located in the middle of the purification tank 1. The mesh of the end metal wire mesh 61 is honeycomb structure, and the mesh of the middle metal wire mesh 62 is rhomboid structure.

[0030] The end wire mesh 61 located at the top and bottom of the purification tank 1, with its honeycomb grid structure, provides stable support for the adsorbent, protecting its relative position during normal operation and regeneration. This prevents uneven gas flow caused by adsorbent movement or accumulation, thus affecting the purification effect. The honeycomb structure has good load-bearing capacity in the vertical direction, capable of withstanding the weight of the adsorbent itself and the stress generated by pressure changes during regeneration. Simultaneously, the small honeycomb grids restrict the movement of adsorbent particles, preventing local accumulation or loss of the adsorbent under conditions of gas flow or equipment vibration. The diamond-shaped wire mesh located in the middle of the purification tank 1, on the one hand, supports the adsorbent, distributing its weight and making the pressure more evenly distributed in the adsorbent bed; on the other hand, the diamond-shaped grid structure has a certain degree of flexibility and elasticity in the horizontal direction. When the adsorbent undergoes volume changes during adsorption-desorption (such as expansion after adsorbing impurities and contraction after desorption) or is subjected to impact forces from gas flow, the diamond-shaped grid can buffer these forces through its own deformation, reducing compression and friction on the adsorbent particles, improving the stability of the adsorbent, and extending its service life. The diamond-shaped wire mesh reduces adsorbent particle breakage and wear during multiple adsorption-desorption cycles, ensuring the adsorbent maintains excellent adsorption performance. Simultaneously, the uniform support helps maintain a uniform gas distribution within the adsorbent bed, improving gas purification efficiency and effectiveness.

[0031] In this embodiment, an electric heating jacket 7 is installed on the outside of the purification tank 1. The controller 5 is electrically connected to the electric heating jacket 7 and is used to control the heating time and heating temperature of the electric heating jacket 7.

[0032] During adsorbent regeneration, the electric heating mantle 7 provides the energy required for desorption by heating the purification tank 1. When the adsorbent has adsorbed a large number of impurities, depressurization alone may not be sufficient to completely desorb all impurities. Heating allows impurity molecules to gain enough kinetic energy to overcome the adsorption forces with the adsorbent, thereby desorbing them from the adsorbent surface and improving the regeneration effect. The controller 5 is electrically connected to the electric heating mantle 7, enabling precise control of the heating time and temperature. Appropriate heating parameters can be set according to different adsorbent types and adsorbate properties to ensure optimal desorption without damaging the adsorbent structure. For example, for some temperature-sensitive adsorbents, strict temperature control can prevent the adsorbent from losing activity or undergoing structural changes due to overheating.

[0033] In this embodiment, the rotary vane vacuum pump 3, molecular pump 4, electric heating mantle 7, first electronic valve 34, and second electronic valve 21 are controlled by the controller 5 to implement a gradient pressure reduction control strategy to shorten the regeneration time. Specifically, the gradient pressure reduction control strategy is as follows:

[0034] 1. Initial stage (0-10 minutes)

[0035] Pressure reduction operation: Close the second electronic valve 21, start the rotary vane vacuum pump 3, open the first electronic valve 34 between the rotary vane vacuum pump 3 and the purification tank 1, and set the power of the rotary vane vacuum pump 3 to 30% of its rated power. During this stage, the pressure slowly decreases from atmospheric pressure to approximately 600 hPa.

[0036] Temperature control: Keep the electric heating jacket 7 closed so that the adsorbent can naturally adapt to the pressure change during the initial depressurization process, and avoid temperature factors interfering with the adsorbent and depressurization process during this stage.

[0037] 2. Intermediate blood pressure reduction phase (10-30 minutes)

[0038] Pressure reduction operation: Increase the power of the rotary vane vacuum pump 3 to 50% of its rated power and continuously reduce the pressure to approximately 200 hPa. During this process, continuously monitor the flow data of the flow meter 43 between the purification tank 1 and the rotary vane vacuum pump 3, and adjust the power of the rotary vane vacuum pump 3 through the controller 5 to ensure that the flow rate is stable within a suitable range.

[0039] Temperature control: Activate the electric heating mantle 7 and raise the temperature to 80℃ at a rate of 2-3℃ per minute. This temperature increase is relatively small, mainly to use moderate heat to promote the detachment of some easily desorbed impurities from the adsorbent while the adsorbent begins to experience a certain pressure drop, without adversely affecting the structure of the adsorbent due to excessively high temperature.

[0040] 3. Transitional depressurization and heating enhancement phase (30-45 minutes)

[0041] Pressure reduction operation: Keep the power of the rotary vane vacuum pump 3 constant, open the first electronic valve 34 between the molecular pump 4 and the purification tank 1 and start the molecular pump 4, setting the power of the molecular pump 4 to 20% of its rated power. The rotary vane vacuum pump 3 continues to reduce the pressure, from 200 hPa to 50 hPa.

[0042] Temperature control: Increase the heating rate of the electric heating mantle 7 to 120°C at a rate of 3-5°C per minute. As the pressure further decreases, increasing the temperature helps to accelerate the desorption of impurities. At the same time, combined with the activation of the molecular pump 4, the desorption effect is enhanced. However, the heating rate still needs to be controlled within a certain range to protect the adsorbent.

[0043] 4. Deep depressurization and high-temperature desorption stage (45-65 minutes)

[0044] Pressure reduction operation: Gradually increase the power of molecular pump 4 to 60% of its rated power, while appropriately reducing the power of rotary vane vacuum pump 3 to 30% of its rated power, so that the pressure is reduced from 50 hPa to 10 hPa.

[0045] Temperature control: Continue to increase the temperature to 160°C at a rate of 3-5°C per minute. During this stage, the combined effect of lower pressure and higher temperature promotes the desorption of stubborn impurities deeply adsorbed by the adsorbent. The entire process is kept stable by monitoring data from flow meter 43 and pressure sensor 13.

[0046] 5. Final blood pressure reduction and stabilization phase (65-90 minutes)

[0047] Pressure reduction operation: Further increase the power of the molecular pump 4 to 80% of its rated power to reduce the pressure from 10 hPa to the required regenerative low pressure (e.g., below 1 hPa).

[0048] Temperature control: Maintain the temperature of the electric heating mantle 7 at 160℃ for a period of time (approximately 10-15 minutes), then slowly cool it down to 100℃ at a rate of 2-3℃ per minute, and maintain this temperature until the pressure reaches the target value. During this stage, while maintaining a low pressure, the temperature adjustment consolidates the desorption effect, ensuring sufficient regeneration of the adsorbent, and avoiding thermal stress on the adsorbent caused by a sudden drop in temperature.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A purification device with a regeneration pressure monitoring function, comprising a filter tank (2) and a purification tank (1), the filter tank (2) being provided with an air inlet, an air vent pipe (12) being connected between the filter tank (2) and the purification tank (1), the purification tank (1) being provided with an air outlet (11), the filter tank (2) being filled with a filter medium, and the purification tank (1) being filled with an adsorbent, characterized in that, The purification tank (1) is provided with a pressure sensor (13) at the top and the bottom, the purification tank (1) is connected with a drawing structure for drawing the gas attached to the adsorbent, the purification tank (1) is provided with a support structure for preventing the adsorbent structure from being impacted, the purification tank (1) is provided with a controller (5) for controlling the regeneration structure, the drawing structure and the purification tank (1) are provided with a first electronic valve (34), and the breather pipe (12) and the gas outlet (11) are provided with a second electronic valve (21).

2. The purification device with a regeneration pressure monitoring function according to claim 1, characterized in that, The drawing structure comprises a rotary vane vacuum pump (3) and a molecular pump (4), the rotary vane vacuum pump (3) and the molecular pump (4) are connected with the purification tank (1), the controller (5) is electrically connected with the rotary vane vacuum pump (3) and the molecular pump (4) for controlling the starting time and the power of the rotary vane vacuum pump (3) and the molecular pump (4), and the rotary vane vacuum pump (3) and the purification tank (1) and the molecular pump (4) and the purification tank (1) are provided with the first electronic valve (34).

3. The purification device with a regeneration pressure monitoring function according to claim 2, characterized in that, The rotary vane vacuum pump (3) and the purification tank (1) and the molecular pump (4) and the purification tank (1) are provided with a flow meter (43).

4. The purification device with a regeneration pressure monitoring function according to claim 1, characterized in that, The support structure comprises a plurality of metal wire meshes, a plurality of the metal wire meshes are longitudinally arranged in the purification tank (1), and the adsorbent is uniformly filled between adjacent metal wire meshes.

5. The purification device with a regeneration pressure monitoring function according to claim 4, characterized by, The plurality of metal wire meshes comprise end metal wire meshes (61) closest to the top or the bottom of the purification tank (1) and middle metal wire meshes (62) located in the middle of the purification tank (1), the grid of the end metal wire meshes (61) is in a honeycomb structure, and the grid of the middle metal wire meshes (62) is in a rhombic structure.

6. The purification device with a regeneration pressure monitoring function according to claim 2, characterized by, The purification tank (1) is externally sleeved with an electric heating jacket (7), and the controller (5) is electrically connected with the electric heating jacket (7) for controlling the heating time and the heating temperature of the electric heating jacket (7).

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